PR preprocessor/53469 - argument tokens of _Pragma miss virtual location

Consider this short test snippet:

-------------------------8-------------------
    #define STRINGIFY(x) #x
    #define TEST(x) \
      _Pragma(STRINGIFY(GCC diagnostic ignored "-Wunused-local-typedefs")) \
      typedef int myint;

    void bar ()
    {
      TEST(myint)
    }
-------------------------8-------------------

The _Pragma is effectively ignored, and compiling with
-Wunused-local-typedefs warns on the local typedef, even though the
pragma should have prevented the warning to be emitted.

This is because when the preprocessor sees the _Pragma operator and
then goes to handle the first token ('GCC' here) that makes up its
operands, it retains the spelling location of that token, not its
virtual location.

Later when diagnostic_report_diagnostic is called to emit the warning
(or ignore it because of the pragma), it compares the location of the
first operand of the pragma with the location of the unused location,
(by calling linemap_location_before_p) and that comparison fails
because in this case, both locations should be virtual.

This patch fixes the issue by teaching the pragma handling to use
virtual locations.

Bootstrapped and tested on x86_64-unknown-linux-gnu against trunk.

libcpp/

	PR preprocessor/53469
	* directives.c (do_pragma): Use the virtual location for the
	pragma token, instead of its spelling location.

gcc/testsuite/

	PR preprocessor/53469
	* gcc.dg/cpp/_Pragma7.c: New test case.

From-SVN: r190714

2 files changed, 11 insertions, 3 deletions

diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
index e4da6ef3a10..7c11fdd0b05 100644
--- a/libcpp/ChangeLog
+++ b/libcpp/ChangeLog
@@ -1,3 +1,9 @@
+2012-05-25  Dodji Seketeli  <dodji@redhat.com>
+
+	PR preprocessor/53469
+	* directives.c (do_pragma): Use the virtual location for the
+	pragma token, instead of its spelling location.
+
 2012-08-14   Diego Novillo  <dnovillo@google.com>
 
 	Merge from cxx-conversion branch.  Configury.
diff --git a/libcpp/directives.c b/libcpp/directives.c
index e37b148da87..a8f2cc43170 100644
--- a/libcpp/directives.c
+++ b/libcpp/directives.c
@@ -1347,13 +1347,15 @@ static void
 do_pragma (cpp_reader *pfile)
 {
   const struct pragma_entry *p = NULL;
-  const cpp_token *token, *pragma_token = pfile->cur_token;
+  const cpp_token *token, *pragma_token;
+  source_location pragma_token_virt_loc = 0;
   cpp_token ns_token;
   unsigned int count = 1;
 
   pfile->state.prevent_expansion++;
 
-  token = cpp_get_token (pfile);
+  pragma_token = token = cpp_get_token_with_location (pfile,
+						      &pragma_token_virt_loc);
   ns_token = *token;
   if (token->type == CPP_NAME)
     {
@@ -1379,7 +1381,7 @@ do_pragma (cpp_reader *pfile)
     {
       if (p->is_deferred)
 	{
-	  pfile->directive_result.src_loc = pragma_token->src_loc;
+	  pfile->directive_result.src_loc = pragma_token_virt_loc;
 	  pfile->directive_result.type = CPP_PRAGMA;
 	  pfile->directive_result.flags = pragma_token->flags;
 	  pfile->directive_result.val.pragma = p->u.ident;